Micrometer lap and guide



April 1, 1947. B. w. LANCE 2,418,413

MICROMETER LAP AND GUIDE Filed May 29, 1946 2 Sheets-Sheet 1 FIG. I. I m

w l 44 7" 4g FIG. 6.

I IINVFNTOR.

BEN w. LANCE, flmylm% ATTORNEYS MICROMETER LAP AND GUIDE Filed May 29, 1946 2 Sheets-Sheet 2 +5 INVENTOR:

' BEN W. LANCE A'ITCLRNEYB Patented Apr. 1, 1947 OFFICE IVIICROMETER LAP AND GUIDE Ben. W. Lance, Geneva, 111.

Application May 29, 1946, Serial No. 673,044

3 Claims.

This invention relates to a micrometer lap and guide for lapping worn spindle and anvil ends, and truing one with the other.

An object of this invention is to provide a device that will lap micrometers of various sizes in an efficient manner.

Another object of the invention is to provide a device that is simple in operation and construction, durable in use and can be inexpensively manufactured.

With the above and other objects and advantages in view, the invention consists of the novel details of construction, arrangement and combination of parts more fully hereinafter described, claimed and illustrated in the accompanying drawings in which:

Figure 1 is an elevational View of an embodiment of the invention in the process of lapping the anvil of a micrometer;

Figure 2 is an elevational view of the invention in the process of lapping the spindle;

Figure 3 is a modified form of the invention;

Figure 4 is an elevational view of the lap for spindle and anvil;

Figure 5 is an end view thereof;

Fi ure 6 is an elevational view of an elongated double flange spindle; V

Figure 7 is an elevational view of the lap for the modification shown in Figure 3;

Figure 8 is a sectional view of the spindle;

Figure 9 is an end view thereof;

Figure 10 is a sectional view of an elongated spindle connected to a short spindle;

Figure 11 is a plan view of the spindle flange guide;

Figure 12 is a sectional view on the line I2-l2 of Figure 11;

Figure 13 is a sectional view on the line l3-l3 of Figure 11, and

Figure 14 is an elevational view of a flan e clamp.

Referring more in detail to the drawings, the reference numeral 20 designates a conventional micrometer which includes the spindle 22 and anvil 24.

Mounted on the spindle 22 is the spindle flange guide 26 which is accomplished by means of the elongated slot 28 and the locking pin 39 having the tapered end 32 is mounted transversely of the slot l8 and is adjusted by means of the Allen screw 34 mounted in the flange guide 26 rotating in the seat 38 in the pin 30. The slot 28 has an inwardly tapered end 40 which coacts with the tapered end 32 of the pin 30 to firmly fix the spindle in position. The guide has a polished face 42 which is adapted to engage one of the polished faces 44 of the elongated flange guide 46 which comprises the rodlike body 48, havin the circular flanges 59 at each end thereof. and

the faces 44 have central threaded bores 52 to receive the Allen screws 54 whereby the face 44 of the guide 46 is engaged with and secured to by means of the threaded bores 56 in which the screws 54 are received, the polished faces 58 of the short flange guide 60. Guide 50 is similar to guide 46 except that the rcdlike body 62 is forshortened; otherwise the circular flanges 64 are of the same conformation as the flanges 50.

In use as shown in Figure 1, the guide 26 is secured to the spindle 22 and the guide M5 is secured thereto by the flange clamps 66, there being one on each side of the flanges, then the guide is secured to the guide 46 by the screws 54. The spindle is then rotated until the lap 68 is in position to lap the anvil 24. The lap 68 is recessed at it! to receive the rough abrasive and recessed at l2 to receive the smooth abrasive and the surfaces 76 are used to apply oil to the anvil.

In Figure 2. the spindle 22 has been removed for lapping by the lap 68, and in Figure 3 the small micrometer 18 has the guide 26 attached to the spindle 80 and the anvil 82 is lapped by the circular lap 84.

Adjustment of the spindle will determine the clearance between the lap and anvil for the use of rough or fine abrasive, and the polished faces will provide true faces for the spindle and anvil.

It is believed that from the foregoing description, the operation and construction of the invention will be apparent to those skilled in. the art, and it is to be understood that changes in the details of construction, arrangement and combination of parts may be resorted to, provided they fall within the spirit of the invention, and the scope of the appended claims.

Having thus described the invention, what is claimed as new and described to be secured by Letters Patent is:

1. A set of the character described for lapping the spindle and anvil of a micrometer comprising flange guide means, an elongated slot in said means for securing said means to the spindle of the micrometer, means mounted transversely of said slot for retaining said spindle therein, and means connected to said guide means for supporting in close proximity to the anvil of the micrometer a lapping tool.

2. The invention as in claim 1 wherein the means connected to said guide means comprises a second guide means, having a rodlike body and circular flanges having polished faces on the opposite ends thereof.

3. The invention as in claim 1 wherein said lapping tool is recessed for the reception of abrasives, and provided with smooth surfaces on the opposite sides of the recesses for the reception of oil to be used in conjunction with said abrasive.

BEN. W. LANCE. 

